Shell to WRB Refining

Shell/Equilon/Tosco/ConocoPhillips/WRB Refining

Open around 1918

The Wood River Refinery is currently owned by WRB Refining LP a 50/50 joint venture between ConocoPhillips and CenovusEnergy

Permit

A Resource Conservation and Recovery Act Permit was issued to Shell on November 3, 1989

RCRA Permit renewed in September 2010

This RCRA Permit requires Shell and WRB Refining LLC to control and clean up the groundwater below the refinery

AREAS OF CONCERN

Historical groundwater and subsurface soil contamination along the western fence line of the North Property (below ground contamination).

1986 Benzene Releases at Route 111 and Rand Ave.

Investigation Area

1986 Benzene Release

January 30, 1986 approx. 8,500 gallons released February 22, 1986 approx. 420 gallons released

From an underground pipe line that ran from the refinery to the river dock

Surface contamination was cleaned up Pipe line was abandoned in place

2005 - 2008

Dissolved benzene showed up in the groundwater in well P-93

Shell conducted soil, groundwater and soil vapor studies

Shell found increased levels of contamination along the western fence line about 800 feet from release site

The highest level of contamination was under the Roxana Public Works Yard

P-60

P-93

2008

IEPA sent Shell and ConocoPhillips a Violation Notice Letter for ground water violations in connection with the offsite contamination not covered by the RCRA Permit.

Violations have been referred to the Illinois Attorney General for prosecution.

Release clean up requirements added to 2010 RCRA Permit.

Historical Refinery Contamination

In 1989 Shell notified the Illinois EPA of groundwater contamination along the western fence line of the North Property

Investigation and remediation for this contamination was required by the Permit

1990 - 2000

Shell installed, maintained and operated a series of :

Oil recovery wells to removed hydrocarbons floating on the groundwater

Water production wells for refinery water needs and to maintain an inward flow of the ground water

2006

In 2006 Shell conducted an investigation around well P-60

Mainly on refinery property

Subsurface soils, groundwater and free phase hydrocarbon

Shell found an increase level of hydrocarbon in well P-60 along the western fence line.

P-60

P-93

2009In response to P-60 and P-93 findings Illinois EPA required Shell to characterize and sample:

Ground water for dissolved hydrocarbons

Subsurface soil

Soil gas for hydrocarbon vapor

Free floating hydrocarbon on the groundwater

2010

Results of 2009 investigation showed the potential for in home vapor intrusion

IEPA required Shell to investigate homes in Roxana for the potential of vapor intrusion

Shell submitted a work plan in 2010 and an implementation plan in 2011

Shell began to conduct in home needs assessments with sampling in February 2011